Gushing — Geology of Clinton County. 



The north end of the Dannemora mountain gneissic ridge projects into 

 the southwestern part of the township, the rock being the pyroxenic gneiss 

 usual on that ridge. 



Series III. Anorthosite forms the main part of Rand hill here, as in 

 Beekmantown. Excellent exposures may be seen along the turnpike and 

 thence southward up the hill. The surface rock is fresher than in Beekman- 

 town, probably due to the more energetic action of the ice-sheet on the 

 northern slopes of the hill. 



As here shown, the rock is less completely granulated than the Keeseville 

 luck, in much of which no large fragments remain. Here none of it has 



undergone complete granulation and much of it is quite coarse, so that 

 the large labradorites, instead of the granular portions, give the main color to 

 the rock. 



Garnet is very abundant, much more so than in the Keeseville rock, 

 so that frequently the granular matrix which surrounds the labradorite 

 individuals has a very pronounced dark red tinge. Some portions of the 

 rock consist entirely of garnet and labradorite. Generally, however, augite 

 and magnetite are also present and hornblende is common. Ilypersthene has 



